三氧化鎢/二氧化鈦奈米複合觸媒製備之材料特性與光催化降解有機物之研究

於奈米光觸媒降解有機物汙染物的應用中，二氧化鈦(TiO2)為最廣泛常見之光觸媒具有無毒性、成本低、來源取得容易等優點；TiO2的應用光源主要為紫外光，這是因為TiO2的能隙約為3.2eV，需小於388nm的紫外光波長即可激發光觸媒產生光催化作用，由於太陽光中約佔5%的能量，而可見光(波長400~700nm)約佔45%。因此，為了有效利用太陽光的能量，並期望在室內等紫外光較微弱的地方也可以使用光觸媒，可見光光觸媒的開發逐漸成為光觸媒的研究主流。本研究是利用高壓釜水熱法合成奈米WO3/TiO2複合觸媒，並在照射可見光下光催化降解染料及有機物。研究中以光催化降解有機物的效率作為觸媒最佳合成條件的指標，觸媒樣品經X射線粉末繞射儀(XRD)、場發射槍掃描式電子顯微鏡 (SEM)、高解析電子能譜儀 (XPS)、衰減式全反射/傅立葉轉換紅外線光譜儀(ATR-FTIR)、紫外光/可見光擴散反射光譜儀(UV-Vis DRS)等儀器分析材料特性，並探討材料特性對於光催化效率的影響。為進一步瞭解其光催化反應機制，經光催化降解後的有機物樣品再以高壓液相層析電灑質譜儀(HPLC-PDA-ESI-MS)、光電二極管紫外光/可見光光譜儀(Ultraviolet/Visible Spectroscopy) 鑑定反應的中間產物。研究結果顯示，WO3/TiO2複合觸媒可以有效提高光催化活性最佳降節參數為(W2-T1-10-250-24)，並利用HPLC-PDA-ESI-MS分離鑑定酸性藍(AB1)、結晶紫(CV)、水楊酸(SA) 之中間產物，探討可能降解路徑，將有助於未來半導體觸媒對於光催化降解有機物之應用。

關鍵字

奈米複合材料；光催化； WO3/TiO2 ；半導體

並列摘要

In the applications of organic pollutant degrading with nano-photocatalysts, titanium dioxide (TiO2), with the advantages of no toxicity, low costs, and easily accessed sources, is commonly utilized. Ultraviolet light (λ＜388nm) is used as the light source of TiO2 as it could be induced the photocatalyst for phtocatalysis with the bandgap 3.2eV. Nevertheless, about 5% energy and 45% visible light (wavelength 400~700nm) are contained in sunlight that the development of visible light photocatalysts have become the major research on photocatalysts in order to use photocatalysts indoors with weaker ultraviolet light. Autoclave Hydrothermal Method is utilized for compounding WO3/TiO2 composite catalyst and degrading dyes and organic compounds with photocatalysis under visible light. In this study, the degradation efficiency of organic compounds with photocatalysis is regarded as the optimal composite indicators for catalysts. The catalyst sample is analyzed the material property with X-ray Powder Diffractometer (XRD), Field Emission Scanning Electron Microscopy (SEM), High resolution X-ray Photoelectron Spectrometer (XPS), Attenuated Total Reflectance/Frustrated Total Internal Reflection (FTIR), and Diffuse Reflectance UV-Vis (UV-Vis DRS) and discussed the effects on the phtocatalysis efficiency. Furthermore, the degraded organic compounds with photocatalysis are identified the intermediate with High-Performance Liquid Chromatography Electron Spray Ionization-Mass Spectrophotometer (HPLC-PDA-ESI-MS) and Ultraviolet/Visible Spectroscopy (UV-Vis) for understanding the phtocatalysis mechanism. The research results show that WO3/TiO2 composite catalyst could effectively enhance the phtocatalysisactivity with the optimal degradation parameter (W2-T1-10-250-24). Besides, the possible degradation pathway could be discussed by separating and identifying the intermediate of Acid Blue 1 (AB1), Cvrstal violet (CV), and Salicylic Acid (SA) with HPLC-PDA-ESI-MS. It could benefit the applications of semiconductor catalysts to the degradation of organic compounds with photocatalysis.

並列關鍵字

Nano-composite ； photocatalysis ； WO3/TiO2 ； semiconductor

參考文獻

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2.C. Bauer, P. Jacques, A. Kalt, Photooxidation of an azo dye induced by visible light incident on the surface of TiO2, Journal of Photochemistry and Photobiology A: Chemistry, 140 (2001) 87-92.

3.B. Noroozi, G. A. Sorial, H. Bahrami, M. Arami, Equilibrium and kinetic adsorption study of a cationic dye by a natural adsorbent—Silkworm pupa, Journal of Hazardous Materials, 139 (2007) 167-174.

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5.H. Chun, W. Yizhong, Decolorization and biodegradability of photocatalytic treated azo dyes and wool textile wastewater, Chemosphere, 39 (1999) 2107-2115.

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三氧化鎢/二氧化鈦奈米複合觸媒製備之材料特性與光催化降解有機物之研究

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